Hi all.
Thanks for your comments. Looking at all the info and purely from a point of ease, it looks like the N chassis might fit the bill. Ultimately it will be Mali's choice though as its going to be his loco, (I suspect he's keeping a sneaky eye on this post).
Roger, can you just confirm as above that the N wheelbase is 2' too long? That does seem alot, but I'm hopeful it may be disguised.
Simon, firstly, keep the faith as regards the dissertation. The current Mrs Penguin has just started out on a uniersity degree, so I feel I know what you're going through. I think the N cylinders are about right for the L1 and I remember from my K1 that DMR do some LNER style bits, (sorry, I don't know the technical terms) for the cylinder front and backs.
As regards the rear bogies, its almost as if you don't see the woods for the trees, as the B1 front bogie, spun around is the correct wheelbase and diameter if my drawings are correct. I'll stand corrected if, (as is usual), if I am wrong, but if right, thats the chassis about sorted.
Obviously still pondering, but I reckon that using the V1 body and just extending the tanks, cabs etc may make a decent job of this. Plenty of plasticard on standby for the job ahead.....
Cheers.
Sean.